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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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/*
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/*
   Copyright 2009-2013 Attila Szegedi

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:
   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
   * Neither the name of the copyright holder nor the names of
     contributors may be used to endorse or promote products derived from
     this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
   BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package jdk.dynalink.support;

import java.lang.invoke.CallSite;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MutableCallSite;
import jdk.dynalink.CallSiteDescriptor;
import jdk.dynalink.RelinkableCallSite;
import jdk.dynalink.linker.GuardedInvocation;

/**
 * A basic implementation of the {@link RelinkableCallSite} as a
 * {@link MutableCallSite}. It carries a {@link CallSiteDescriptor} passed in
 * the constructor and provides the correct implementation of the
 * {@link #initialize(MethodHandle)} method. Subclasses must provide
 * {@link #relink(GuardedInvocation, MethodHandle)} and
 * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}
 * methods.
 */
public abstract class AbstractRelinkableCallSite extends MutableCallSite implements RelinkableCallSite {
    private final CallSiteDescriptor descriptor;

    /**
     * Creates a new abstract relinkable call site.
     * @param descriptor the descriptor for this call site that will be returned
     * from {@link #getDescriptor()}. The call site's {@link CallSite#type()}
     * will be equal to descriptor's {@link CallSiteDescriptor#getMethodType()}.
     * @throws NullPointerException if {@code descriptor} is null.
     */
    protected AbstractRelinkableCallSite(final CallSiteDescriptor descriptor) {
        super(descriptor.getMethodType());
        this.descriptor = descriptor;
    }

    @Override
    public CallSiteDescriptor getDescriptor() {
        return descriptor;
    }

    @Override
    public void initialize(final MethodHandle relinkAndInvoke) {
        setTarget(relinkAndInvoke);
    }
}
